高压诱导有机CT共晶荧光发射原位可调控性的光谱研究

Spectroscopic Study on High Pressure Induced in situ Tunable Luminescence of Organic CT Cocrystals

有机电荷转移(CT)共晶是通过给体(D)与受体(A)分子之间的CT作用形成具有特定结构的分子有序组合体,其带隙较窄便于调控,表现出新颖各异的光学性质。最近该课题小组利用高压对顶砧技术,对有机CT共晶材料9ACA-TFP的荧光发射进行原位持续调控^([1])。与传统基于合成或掺杂法来调控有机共晶体荧光发射相比,通过压力刺激有机CT共晶的荧光发射,其方法简单有效且实现了对荧光发射的原位持续调控。基于此研究,为了揭示有机CT共晶在高压下荧光调控机制的共性和规律,以TFP(2,3,5,6-四氟对苯二甲腈)为接受体,设计合成具有蓝色发光CT共晶系列,通过压力刺激对有机CT共晶材料体系的荧光发射进行了原位持续调控,并利用光谱学技术手段(紫外及拉曼)监控调控过程中给受体间CT作用的变化,讨论了变压力对有机共晶给受体间分子间相互作用的敏感性及可控性。

Organic charge transfer(CT)cocrystals formed viaCT interactions of electron donors(D)and acceptors(A).Their band gaps are narrow and easy to control,which make them show novel and various optical properties.In our research work,high pressure induced in situtunable luminescence of organic CT cocrystal is achieved for the first time.In order to reveal the commonness and regularities of fluorescence regulation mechanism of organic CT cocrystals under high pressure,we designed and synthesised the series of organic CT cocrystals,fusion of high pressure stimuli to realize in situadjust and control the luminescence of organic CT cocrystals,using the UV-Vis,Fluorescence and Raman spectroscopic as a characterization method direct insight the mechanism of tunable CT interaction between donor and acceptor of organic cocrystals at the molecular level,the condition changes acting on the sensitivity and controllability of the CT interaction of organic cocrystal will be investigated,further to reveal its mechanism.